Methods for controlling dual catalyst olefin polymerizations with an alcohol compound

摘要

Methods for controlling properties of an olefin polymer using an alcohol compound are disclosed. The MI and the HLMI of the polymer can be decreased, and the Mw and the Mz of the polymer can be increased, via the addition of the alcohol compound.

主权项

1. A method of controlling a polymerization reaction in a polymerization reactor system, the method comprising:
(i) contacting a dual catalyst system with an olefin monomer and an optional olefin comonomer in the polymerization reactor system under polymerization conditions to produce an olefin polymer, wherein the dual catalyst system comprises a first metallocene catalyst component, a second metallocene catalyst component, an activator, and a co-catalyst; and (ii) introducing an amount of an alcohol compound into the polymerization reactor system to (I) reduce a melt index parameter of the olefin polymer; (II) increase a molecular weight parameter of the olefin polymer selected from Mw, Mz, or both; or (III) reduce a melt index parameter of the olefin polymer and increase a molecular weight parameter of the olefin polymer selected from Mw, Mz, or both.